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Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull smp hotplug updates from Thomas Gleixner:
 "This is the next part of the hotplug rework.

   - Convert all notifiers with a priority assigned

   - Convert all CPU_STARTING/DYING notifiers

     The final removal of the STARTING/DYING infrastructure will happen
     when the merge window closes.

  Another 700 hundred line of unpenetrable maze gone :)"

* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (70 commits)
  timers/core: Correct callback order during CPU hot plug
  leds/trigger/cpu: Move from CPU_STARTING to ONLINE level
  powerpc/numa: Convert to hotplug state machine
  arm/perf: Fix hotplug state machine conversion
  irqchip/armada: Avoid unused function warnings
  ARC/time: Convert to hotplug state machine
  clocksource/atlas7: Convert to hotplug state machine
  clocksource/armada-370-xp: Convert to hotplug state machine
  clocksource/exynos_mct: Convert to hotplug state machine
  clocksource/arm_global_timer: Convert to hotplug state machine
  rcu: Convert rcutree to hotplug state machine
  KVM/arm/arm64/vgic-new: Convert to hotplug state machine
  smp/cfd: Convert core to hotplug state machine
  x86/x2apic: Convert to CPU hotplug state machine
  profile: Convert to hotplug state machine
  timers/core: Convert to hotplug state machine
  hrtimer: Convert to hotplug state machine
  x86/tboot: Convert to hotplug state machine
  arm64/armv8 deprecated: Convert to hotplug state machine
  hwtracing/coresight-etm4x: Convert to hotplug state machine
  ...
This commit is contained in:
Linus Torvalds
2016-07-29 13:55:30 -07:00
parent 1a81a8f2a5 4fae16dffb
commit a6408f6cb6
75 changed files with 1321 additions and 2018 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
drivers/perf/arm_pmu.c
View File

@@ -688,30 +688,29 @@ static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler)
return 0;
}
static DEFINE_MUTEX(arm_pmu_mutex);
static LIST_HEAD(arm_pmu_list);
/*
* PMU hardware loses all context when a CPU goes offline.
* When a CPU is hotplugged back in, since some hardware registers are
* UNKNOWN at reset, the PMU must be explicitly reset to avoid reading
* junk values out of them.
*/
static int cpu_pmu_notify(struct notifier_block *b, unsigned long action,
void *hcpu)
static int arm_perf_starting_cpu(unsigned int cpu)
{
int cpu = (unsigned long)hcpu;
struct arm_pmu *pmu = container_of(b, struct arm_pmu, hotplug_nb);
struct arm_pmu *pmu;
if ((action & ~CPU_TASKS_FROZEN) != CPU_STARTING)
return NOTIFY_DONE;
mutex_lock(&arm_pmu_mutex);
list_for_each_entry(pmu, &arm_pmu_list, entry) {
if (!cpumask_test_cpu(cpu, &pmu->supported_cpus))
return NOTIFY_DONE;
if (pmu->reset)
pmu->reset(pmu);
else
return NOTIFY_DONE;
return NOTIFY_OK;
if (!cpumask_test_cpu(cpu, &pmu->supported_cpus))
continue;
if (pmu->reset)
pmu->reset(pmu);
}
mutex_unlock(&arm_pmu_mutex);
return 0;
}
#ifdef CONFIG_CPU_PM
@@ -822,10 +821,9 @@ static int cpu_pmu_init(struct arm_pmu *cpu_pmu)
if (!cpu_hw_events)
return -ENOMEM;
cpu_pmu->hotplug_nb.notifier_call = cpu_pmu_notify;
err = register_cpu_notifier(&cpu_pmu->hotplug_nb);
if (err)
goto out_hw_events;
mutex_lock(&arm_pmu_mutex);
list_add_tail(&cpu_pmu->entry, &arm_pmu_list);
mutex_unlock(&arm_pmu_mutex);
err = cpu_pm_pmu_register(cpu_pmu);
if (err)
@@ -861,8 +859,9 @@ static int cpu_pmu_init(struct arm_pmu *cpu_pmu)
return 0;
out_unregister:
unregister_cpu_notifier(&cpu_pmu->hotplug_nb);
out_hw_events:
mutex_lock(&arm_pmu_mutex);
list_del(&cpu_pmu->entry);
mutex_unlock(&arm_pmu_mutex);
free_percpu(cpu_hw_events);
return err;
}
@@ -870,7 +869,9 @@ out_hw_events:
static void cpu_pmu_destroy(struct arm_pmu *cpu_pmu)
{
cpu_pm_pmu_unregister(cpu_pmu);
unregister_cpu_notifier(&cpu_pmu->hotplug_nb);
mutex_lock(&arm_pmu_mutex);
list_del(&cpu_pmu->entry);
mutex_unlock(&arm_pmu_mutex);
free_percpu(cpu_pmu->hw_events);
}
@@ -1061,3 +1062,17 @@ out_free:
kfree(pmu);
return ret;
}
static int arm_pmu_hp_init(void)
{
int ret;
ret = cpuhp_setup_state_nocalls(CPUHP_AP_PERF_ARM_STARTING,
"AP_PERF_ARM_STARTING",
arm_perf_starting_cpu, NULL);
if (ret)
pr_err("CPU hotplug notifier for ARM PMU could not be registered: %d\n",
ret);
return ret;
}
subsys_initcall(arm_pmu_hp_init);